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2. Karatmeter - Wikipedia

   en.wikipedia.org/wiki/Karatmeter

   There are many models of Gold Purity Testing machines available - from portable (light weight) to industrial grade machines. Apart from X-ray spectrometer technique, other older traditional methods are using the TouchStone and Acid to test the gold purity. But TouchStone and Acid are destructive testing - a tiny sample of gold is cut and then ...

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   en.wikipedia.org/wiki/EBay

   eBay office in Toronto, Canada. eBay Inc. (/ ˈ iː b eɪ / EE-bay, often stylized as ebay or Ebay) is an American multinational e-commerce company based in San Jose, California, that allows users to buy or view items via retail sales through online marketplaces and websites in 190 markets worldwide.

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5. Digital gold currency - Wikipedia

   en.wikipedia.org/wiki/Digital_gold_currency

   Digital gold currency (or DGC) is a form of electronic money (or digital currency) based on mass units of gold. It is a kind of representative money , like a US paper gold certificate at the time (from 1873 to 1933) that these were exchangeable for gold on demand.

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7. Touchstone (assaying tool) - Wikipedia

   en.wikipedia.org/wiki/Touchstone_(assaying_tool)

   This method has been used since ancient times. In modern times, additional tests can be done. The trace will react in different ways to specific concentrations of nitric acid or aqua regia, thereby identifying the quality of the gold: 24 karat gold is not affected but 14 karat gold will show chemical activity.